curl和gopher协议（ssrf的利用）

2023-12-15 10:53| 来源: 网络整理| 查看: 265

文章目录一、基础知识的学习(1) cURL(2) PHP的curl函数(3) gopher协议3.1 用gopher协议get传数据3.2 用gopher协议post传数据3.3 在ssrf中使用gopher协议 (4) file协议和dict协议

一、基础知识的学习 (1) cURL

在这里插入图片描述 cURL是一个利用URL语法在命令行下工作的文件传输工具。它支持文件上传和下载，所以是综合传输工具。cURL还包含了用于程序开发的libcurl。

cURL支持的通信协议有：FTP、FTPS、HTTP、HTTPS、Gopher、SCP、Telnet、DICT、FILE、LDAP、LDAPS、IMAP、POP3、SMTP和RTSP。curl还支持SSL认证、HTTP POST、HTTP PUT、FTP。

curl protocol://address:port/url?args

(2) PHP的curl函数

菜鸟教程 PHP支持libcurl库与各种的服务器使用各种类型的协议进行连接和通讯。

几个相关函数 curl_init() 初始化一个cURL会话。

初始化一个新的会话，返回一个cURL句柄，供curl_setopt(), curl_exec()和curl_close() 函数使用

curl_setopt() 设置一个cURL传输选项。

curl_setopt ( $ch , $option , $value )

curl_exec() 执行cURL会话。

curl_close() 关闭cURL会话。

【实列】

(3) gopher协议

gopher协议支持发出GET、POST请求：可以先拦截get请求包和post请求包，再构造成符合gopher协议的请求。gopher协议是ssrf利用中一个最强大的协议（俗称万能协议）。

可以攻击内网的 FTP、Telnet、Redis、Memcache，也可以进行 GET、POST 请求，还可以攻击内网未授权MySQL。

gopher://IP:port/_{TCP/IP数据流}

3.1 用gopher协议get传数据 //ssrf.php

【遇到了坑】

1.直接抓包，URL编码后用gopher协议发送

. 2. 最后是因为CRLF的问题，把url编码payload中的%0a改为%0d%0a

curl gopher://127.0.0.1:80/_%47%45%54%20%2f%73%73%72%66%2e%70%68%70%3f%74%65%73%74%3d%61%61%61%20%48%54%54%50%2f%31%2e%31%0d%0a%48%6f%73%74%3a%20%31%32%37%2e%30%2e%30%2e%31%0d%0a%55%73%65%72%2d%41%67%65%6e%74%3a%20%4d%6f%7a%69%6c%6c%61%2f%35%2e%30%20%28%57%69%6e%64%6f%77%73%20%4e%54%20%31%30%2e%30%3b%20%57%69%6e%36%34%3b%20%78%36%34%3b%20%72%76%3a%37%30%2e%30%29%20%47%65%63%6b%6f%2f%32%30%31%30%30%31%30%31%20%46%69%72%65%66%6f%78%2f%37%30%2e%30%0d%0a%41%63%63%65%70%74%3a%20%74%65%78%74%2f%68%74%6d%6c%2c%61%70%70%6c%69%63%61%74%69%6f%6e%2f%78%68%74%6d%6c%2b%78%6d%6c%2c%61%70%70%6c%69%63%61%74%69%6f%6e%2f%78%6d%6c%3b%71%3d%30%2e%39%2c%2a%2f%2a%3b%71%3d%30%2e%38%0d%0a%41%63%63%65%70%74%2d%4c%61%6e%67%75%61%67%65%3a%20%7a%68%2d%43%4e%2c%7a%68%3b%71%3d%30%2e%38%2c%7a%68%2d%54%57%3b%71%3d%30%2e%37%2c%7a%68%2d%48%4b%3b%71%3d%30%2e%35%2c%65%6e%2d%55%53%3b%71%3d%30%2e%33%2c%65%6e%3b%71%3d%30%2e%32%0d%0a%43%6f%6e%6e%65%63%74%69%6f%6e%3a%20%63%6c%6f%73%65%0d%0a%55%70%67%72%61%64%65%2d%49%6e%73%65%63%75%72%65%2d%52%65%71%75%65%73%74%73%3a%20%31%0d%0a%43%61%63%68%65%2d%43%6f%6e%74%72%6f%6c%3a%20%6d%61%78%2d%61%67%65%3d%30%0d%0a%0d%0a 3.2 用gopher协议post传数据 //ssrf.php curl gopher://47.101.14.211:80/_%50%4f%53%54%20%2f%73%73%72%66%2e%70%68%70%20%48%54%54%50%2f%31%2e%31%0d%0a%48%6f%73%74%3a%20%34%37%2e%31%30%31%2e%31%34%34%2e%31%39%37%0d%0a%55%73%65%72%2d%41%67%65%6e%74%3a%20%4d%6f%7a%69%6c%6c%61%2f%35%2e%30%20%28%57%69%6e%64%6f%77%73%20%4e%54%20%31%30%2e%30%3b%20%57%69%6e%36%34%3b%20%78%36%34%3b%20%72%76%3a%37%30%2e%30%29%20%47%65%63%6b%6f%2f%32%30%31%30%30%31%30%31%20%46%69%72%65%66%6f%78%2f%37%30%2e%30%0d%0a%41%63%63%65%70%74%3a%20%74%65%78%74%2f%68%74%6d%6c%2c%61%70%70%6c%69%63%61%74%69%6f%6e%2f%78%68%74%6d%6c%2b%78%6d%6c%2c%61%70%70%6c%69%63%61%74%69%6f%6e%2f%78%6d%6c%3b%71%3d%30%2e%39%2c%2a%2f%2a%3b%71%3d%30%2e%38%0d%0a%41%63%63%65%70%74%2d%4c%61%6e%67%75%61%67%65%3a%20%7a%68%2d%43%4e%2c%7a%68%3b%71%3d%30%2e%38%2c%7a%68%2d%54%57%3b%71%3d%30%2e%37%2c%7a%68%2d%48%4b%3b%71%3d%30%2e%35%2c%65%6e%2d%55%53%3b%71%3d%30%2e%33%2c%65%6e%3b%71%3d%30%2e%32%0d%0a%52%65%66%65%72%65%72%3a%20%68%74%74%70%3a%2f%2f%34%37%2e%31%30%31%2e%31%34%34%2e%31%39%37%2f%73%73%72%66%2e%70%68%70%0d%0a%43%6f%6e%74%65%6e%74%2d%54%79%70%65%3a%20%61%70%70%6c%69%63%61%74%69%6f%6e%2f%78%2d%77%77%77%2d%66%6f%72%6d%2d%75%72%6c%65%6e%63%6f%64%65%64%0d%0a%43%6f%6e%74%65%6e%74%2d%4c%65%6e%67%74%68%3a%20%39%0d%0a%4f%72%69%67%69%6e%3a%20%68%74%74%70%3a%2f%2f%34%37%2e%31%30%31%2e%31%34%34%2e%31%39%37%0d%0a%43%6f%6e%6e%65%63%74%69%6f%6e%3a%20%63%6c%6f%73%65%0d%0a%55%70%67%72%61%64%65%2d%49%6e%73%65%63%75%72%65%2d%52%65%71%75%65%73%74%73%3a%20%31%0d%0a%43%61%63%68%65%2d%43%6f%6e%74%72%6f%6c%3a%20%6d%61%78%2d%61%67%65%3d%30%0d%0a%0d%0a%74%65%73%74%3d%61%61%61%61

在这里插入图片描述

《post数据包》 POST /ssrf.php HTTP/1.1 Host: 47.101.14.211 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko/20100101 Firefox/70.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8 Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2 Content-Type: application/x-www-form-urlencoded Content-Length: 9 Connection: close Upgrade-Insecure-Requests: 1 Cache-Control: max-age=0 . test=aaaa

3.3 在ssrf中使用gopher协议

wireshark抓包，追踪数据流。转换为URL编码。 --> 使用gopher协议发送tcp/ip数据包

想获取攻击的TCP数据包，可以使用socat进行端口转发

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